Could I request a new disk type/selection for Spectrum +3 and Amstrad CPC disks? They're single-sided double-density disks, with 40 normal tracks (allow up to 42), and the head is single-stepped between tracks. They're flippy disks, but the original drives only support accessing a single side at a time.

None of the existing disk types match these requirements. So far the only option seems to be to dump it as a double-sided disk, which doubles the file size and time to create each image.